I Just Killed a Mouse, and Unit 749 Showed Up?

While clearing a blocked drain for his semi-Yin landlord, Lai Ye accidentally awakens the Spirit-Devouring System. Initially believing he is destined to become an unstoppable demon-hunter, he soon discovers a harsh reality: every supernatural ability requires payment in lifespan. A single glance with the Truth-Piercing Eye costs ten days of life, and unleashing an ultimate attack overdrafts three whole years! To accumulate survival points and extend his days, he joins the enigmatic Unit 749, biding his time and scraping by while strictly rationing his precious lifespan to avoid wasting a single second. Yet, whenever his teammates face mortal peril, he unfailingly burns his remaining life force to stand in the breach. Witness how Lai Ye walks the tightrope between sheer survival and unyielding righteousness.